Combined choke and needle valve control



Oct. 6, 1925 J. R. TITMAN COMBINED CHOKE AND NEEDLE VALVE CONTROL FiledMay 13, 1924 M 1 M! ATTO NEY.

Patented Oct. 6, 1925.

UNITED- STATES 1,556,179 TEN OFFICE.

'JACOB RUSSELL 'i rrMAiv, or nA iwAir, NEW JERSEY, ASSIGNOR or ONE-THIRDT .GEoRGn B. TITMAN AND onn'rnmn T0 SHERMAN F. TITMAN, BOTH or BAHWAY,

NEW JERSEY.

Application filed May 13,

. Combined Choke and Needle Valve Con trols, of which the following is aspecification.

This invention relates to improved combined choke and needle valvecontrol for carburetors and like devices.-

An object of this invention is to provide I improved means'for'controlling the needle valve of a carburetor, to thereby regulatethe proportion of gaseous fuel of the explosive mixture supplied by thecarburetor: .A further-obj ect of the invention isto pro- 7 videimproved means for controlling a choke valve or equivalent of thecarburetor.

The usual approved type of carburetor for Ford automobiles comprises athreaded needle valve stem for adjusting by rotational movement the jetof the gasoline or like liquid fuel discharged by the nozzle in themixing chamber; the carburetor is also provided with achoke in the formof a butterfly valve, located in the main air in let passage leading tothe mixing chamber.

" Thebutterfly valve is rotationally mounted on a shaft, one end ofwhich shaft extends exteriorly of the casing of the carburetor, at whichexterior. shaft end an arm is attached. To the arm of the butterflyshaft- .Ipf Fig. 1, on a somewhat eiilarged scale; Fig. 3 is as'ectionalelevation'on line 33v is connected awire leading to a bell crank,

- or by means of an equivalent connection, to

- effect when pulled the movement of the butterfly valve from itsnormally open position to its partially or wholly closed posi- 40 tionto prime the motor. A compressional spring, usually acoi legl springencircling the exteriorshaft end,- serves normally to hold the butterflyvalve in its fully open position and to return the butterfly valve toits fully open position from a partially or Wholly closed position;.Usually, the arm of the choke valve is one arm of a bell crank, theother arm of the bell crank being utilized for connection by means of aWire or equivalent extending forwardly of the radiator to aiford primingof the carburetor when the motor 1s being manually cranked. Pursuant tothe preferred forms ofthe invention, the needle valve. control and the ICOMBINED CHOKE AND NEEDLE VALVE ('JOITJPItOTI.

1924. ,s riai irol'7i2,992.

regulation of the needle valve and the choke may be simultaneously,efi'ected to variable extents as desired and to permit independentregulation of either as desired. Such pre- 9 ferred form comprisessuitable means car-.

ried by the device for connection'with the stem of the needle valvewhereby upon r0- 1 tation of the manipulating member the. needle valveis readily and accuratel set the.

and upon longitudinal movement' 0 manipulating member the extent of'opening andclosing of the choke valve is had in correspondence to theextent of. longitudinal movement of the-manipulating'member andvindependently of. the rotary movement of the manipulating member foradjustment of the needle valve.

Further features and objects of the in- I vention will be more fullyunderstood from the following detail description and the accompanyingdrawings,- in which Fig. 1 is a diagrammatic view, showing in sideelevation a carburetor and co-ordin-ated parts of an automotive engine,and repre senting in vertical section the cowl and dash-v board of 'anautomobile; Y

" Fig. 2 is a sectional elevation on line 2-2 of Fig. 'I, on a greatlyenlarged scale;-

of Fig. 1, on the same scale as Fig 3; and

Fig- 5 is a detail frontelevation of the manipulating-member and aportion of the dash-board.

Referring to Fig. 1, of the drawings, the carburetor is indicatedat 10,which may be of any approved type. The air inlet of the carburetor isshown at 11, which mayb e connected to an air-stove 12, or commun1- catedirectly with the atmosphere, as desired. The discharge 13 of thecarburetor co nmunicates in any desirable manner -with the inlet 14 of amanifold 15 to the respective cylinders of the explosive engine,indicated generally at 16.

The threaded stem of shown at 17' and is illustrated as provided withany approved adjusting member 18, having a pair of spaced openings.

The choke of the carburetor 1s usually in the form of a butterfly valve,the shaft 19 of which extendsexteriorly of the casing 11 of the inlet ofthe carburetor, 10, to which shaft 19 is secured the bellcrank 20,having a connection opening '21 in its one arm for regulation from thedash-board side and the I connection. opening 22 for regulation by meansof the link 23 fromth'e radiator side. The butterfly valve of the usualFord carburetor is normally held in its fully open position by means ofa spring (not shown).

My improved combined needle valve and.

choke regulator comprises suitable means suchas the fork 23' forcoupling with the spaced openings of the. adjusting plate 18 of thevalve stem 17 The forked member 23 may be locked to the plate 18 bymeans of one or more cotter pins 24. Such forked member 23. iscarried'bythe sleeve member 25, see also Fig. 2, slidably receiving the end 26 of.the arm 27, as by the provision of the elongated slot 28, 28in thesleeve member 25,'into whioi slots 28, 28 projects the oppositeends ofthe pin 29, secured to.

the arm 27, as by a tight fit in a perforation adjacent the end 26 ofthe arm 27.

The manipulating member is shownln Fig. 1 is in the form of a knob 30,see also Fig; 5, secured at the upper end of the arm 31 to extendadjacentthe dash-board 32,

within convenient reach of the operator when seated at the steering'wheel (not shown). A convenient form of mounting, is by drilling anopening 33- in the dash-board 32, which opening 33 may be slightlylarger than the diameter of the arm 31, and also -by forming the opening34 in the usual partition or dash 35' within the cowl 36 of theautomobile and enclosed by the hood 37. The opening 34 is of somewhatenlarged dimension to afford vertical movement of the arm 31, as willappear more fully hereinafter. The manipulating member 30 may beprovided with a pointer 38, to indicate its neutral position whenstanding vertically upward. A turn of the manipulating member '30 andits pointer 38 to the left increases to a corresponding extent therichness of the explosive Inixture,.whereas a turn of opposite faces tothe fork 43 of metal or like resilient material, carried at the lowerend of the arm 31.

I Preferably,the pivotal connections of the as by the stud 45 having acentral recess 46 for receiving the lower end 31 of the arm 31 and a setscrew 47 extending through a suitably threaded opening 48 transverselyto the recess 46. j

' Suitable connection is provided between I, the arm 31 and thebellcranlc20 of the choke valve of the carburetor 10, as by means of thesleeve 50 having the laterally extending pivot lug 51 forinsertionthrough a pivot opening in the arm 52-of a suitable bellcrank, such .asis illustrated in Fig. 1, and mounted on the bracket 53 secured tothepartition or dash. 35; the other arm 54 0f such bellcrank is connectedto the upper end of the link and the lower end of the link 55 ispivotally connected in the opening 21 of the bellcrank 20 of the chokevalve of the carburetor 10. maybe locked pivotally to the lug 51 bymeans of a cotter pin 56, or the like, and a washer 57 may be employedif necessary.

The length of the sleeve 50 when in abutting relation with the stud 45,for'the desired setting of the arm 31 by means of the set screw 47, issuch that when the manipulating member 30 is in its fully depressedusual return spring of the carburetor choke valve to return said chokevalve to its fully opened position. Such desired setting is attainedjbythe adjustment afforded by the recess 46- of the stud 45 and the set.screw 47.

'As indicated above, the richness or leanness-of the gaseous mixture isattained by rotating the manipulating member 30 either to the right forleanness, as indicated by the arrow'Gfi, see Fig. 1, or to the left forrichness.

In such operation, the collar 59 remains in quiescent relation to thebellcrank arm The desired extent of rotation of the stem 17- of theneedle valve is attained by the rotative transmission afforded by theThe bellcrank arm 52 position, as indicated in Fig. 1, it permits the.

of the conneetion of the pin 29 in the slots 28 accommodates movement ofthe sleeve member longitudinally of the arm 27 and its end 26, andaffords nicety of arcuate setting. of the needle valve correspondingaccurat'ely to the extent of the arc of movement-of the manipulatingmember 30. The fork con- -11BCl31OI1 23' of the arm 27 with theapertured plate 18 of the needle valve stem 17 provides for a rockingmovementiof the fork 23' relatively to the plate 18, but substantiallywithout 1055 of arcuate transmission. Such arrangement simplifies theassembly and mounting of the device, without sacrifice of accuracy ofsetting.

For convenience of construction and directness 'of operation, the fork23 may be pivotally carried at the end of the sleeve member 25, forwhich purpose,-th sleeve member may be formed of a tube, its oppositeslots 28, 28 cut by a circular rip saw and its lower end open-slottedand flat tened to receive the bod}, portion of the fork v '23 andthereafter pinched toem'brace the same.

The choke valve ofthe carburetor is regulated by axial or longitudinalmovement of the arm 31, namely by the operator pulling the manipulatingmember 30 in the direction of the arrow 61, see Fig. 1, therebyactuating the collar50 in the corresponding direction as the 'arrow 60,and to-correspond in'g extent by reason of the stud engaging the collarand serving as astop means therefor, whereby the bellcrank arm 52 is}-oscillated and the wire 55 or equivalent is correspondingly displaced torotate the bell-,

crank 20 of the choke valve of the carburetor '10, also to acorresponding extent. By reason of the device being fulcrumed at itsopposite ends, the opening 23 in the partit1on 35 iselongatedvertically. From the above, it will appear that upon completing thepriming of the motor as when starting the motor, the operator depressesthe -.manipulating member 30, with or without turning the manipulatingmember 3O, whereby the arm means comprising the upper arm and the lowerarm is reduced in efi'ective length by its mutually-sliding. members,and;

effects the movement of thestop'means or Stud 45 to afl'ord a return ofthe sleeve 50 and the arm 20 of thecarburetor choke valve to return thechoke valve to its fully open position under action of its returnFrom-the above, it will be-observed that my control afiords-when desiredthe joint operation of the needle valve of the 'carbu-- rotor and of thechoke valve of-the carburetor to such extents of either as-may bedesired when priming or otherwise controlling the motor, as well asto-afiord independent operation of the needle jvalve and,independentoperation of the choke valve.

The provision of a single stop means for the sleeve controlling thechoke Valve for exerting a pull on the wire 55 of the choke isadvantageous, in that the installation of my control device involves"the simple adjilstment of the length of the arm 31 by the setscrew 4:7,wherebyjthe stud 45- is brought --into abutting relation with the sleeve50,

as hereinabove set forth, when the arm means 1s reduced to its minimumeffective len h.

on the arm- 31 on the side of the sleeve 50 opposite to that 'of thestud. A5, enablesthe parts of my control devicewhen the in'anipue,lating member is depressed by the operator tobe speedily returned toits fully returned position, the return spring of the choke valve of thecarburetor positively assisting in the return movement of the parts ofmy control device and as well returning the choke valve to its fullyopen position in a' e absence of any stop for the sleeve 50 p minimumperiod of time, thus obviating any tendency of the carburetor to flood.-

Whereas, I have descrlbed my invention by reference to specific formsthereof, it will i be understood" that many changes and modificationsmay be made without departing from the spirit of the invention,

I claim l Y 1. An adjusting device for a carburetor provided with arotatably adjustable needle valve stem'and a choke, comprising an arm,

a manipulating member secured-atone end' i of said arm for setting'saidarm, arm means 'pivotally connected at one of its ends to said rotatablyadjustable needle-valve stem, said arm means comprising telescopicallyrelated members, rotation transmitting connection ineansconnecting theotherend of saidarm means with "the other end of. said first-named arm,means rotatably loosely mounted on said device for operating said chokeand stop means for limiting the movement of said choke operating meansaxially of said named arm. 2. An adjusting device for a carburetorprovided with a rotatably adjustable needle valve stem and a choke,comprising an arm,

a manipulating member secured at one end ofsaid arm \for setting saidarm, arm means pivotally connected at one of its ends-to said rotablyadjustable needle valve stem, said arm means comprising telescopicallyrelated members, rotation transmittin connection means connecting theother en of said arm 7 means with'the other end of said first-named arm,sleeve means rotatably loosely mounted on said device for operating saidchoke and stopmeans carried by said first-named arm for limiting themovement of said choke operating sleeve means axially of said firstnamedarm.

stem, .said arm means comprising telescopically related members,rotation transmitting connection'means connecting the other end of saidarm means with the other end of said first-named arm, means rotatablymounted on saiddevice for operating said choke and stop means forlimiting the movement of said choke operating mean axially of said firstnamed arm. I

4. An adjusting device for a carburetor provided With a rotatablyadjustable needle valve stem and a choke, comprising an arm,

a manipulating member secured at one end of said arm for setting saidarm, means adjacent the other end of said arm for adjusting theeifective length of said arm, arm

- mally holding means pivotally connected at one of its ends to saidrotatably adjustable needle valve stem, said arm means comprisingtelescopically related members, rotation transmitting connection meansconnecting the other end of said arm means with the other end of saidfirst-named arm, means rotatably loosely mounted on said first-named armfor operating said choke operating. means axially of said device, andstop means for limiting the movement of said choke operating meansaxially of said first named arm.

5. An adjusting device for a carburetor provided With a rotatablyadjustable needle valve stem and .a choke, comprising an arm means, amanipulating. member secured at one end of said arm means for setting'said arm means, means adjacent the other end of said arm means foradjusting the eiiective length of said arm means, means at one end ofsaid arm means for pivotal connection With said rotatably adjustableneedle valve stem, said arm means; further comprising telescopicallyrelated members, rotation transmitting, connection means for said armmeans, means rotatably loosely mounted on said devicefon operating saidchoke and stop means carried by said arm means for limiting the movementof said choke operating means axially of said arm means.

6. An. adjusting device for carburetors provided with a rotatablyadjustable needle valve stem and a choke having a spring norsaid chokein itsopen position, comprising arm means, a manipulating member securedadjacent one end of said arm for imparting at Will either rotational oraxial displacement or both to said arm means, said arm-means comprisingtelescopically related members for securing varying effective length ofsaid arm means incidentupon axial displacement of said manipulatingmember, .articulated means for said arm means for transmittingrotational movement to said adjustable needle v valve stem, means freelyrotatably'mounted on said arm means for operating said choke and a stopcarried by said arm means, said stop being disposed between said chokeoperating means and said articulated means whereby upon axialdisplacement of said manipulating member-in the direction from saidcarburetor said stop serves to limit the movement of said chokeoperating means axiallyv of said arm means, said arm means beingfree-from any stop for said choke operating means in the oppositedirection of axial displacement.

7-. An adjusting device for carburetors provided Witha rotatablyadjustable needle valve stem and achoke having a spring normally holdingsaid choke in its open posi tion, comprising arm means, a manipulatingmember secured adjacent one end of said arm means for imparting at willeither rotational or axial displacement or both to said arm means, saidarm-means comprising telescopically-related members for securing varyingefi'ective' length of said arm meansv incident uponaxial displacement ofsaid-ma- I l nipulating member,- articulated means for said arm meansfor transmitting rotational movement-"to said adjustable needle valvestem, a collar loosely mounted on said arm means for operating saidchoke and a stop carried by said arm means, said stop'being disposedbetween said collar and said articulated means whereby .upon axialdisplace-- ment of said manipulating member in the direction from saidcarburetor said stop serves to limit the movement of said collar axiallyof said-arm means, said arm means being free from any stop for saidcollar in the opposite direction of axial displacement.

8. The combination With a carburetor provided With a rotatablyadjustable needle valve stem and a choke having aspring tending to\resiliently return said choke to its open position; of an adjustingdevice havinga manipulating membcrit'or regulating to any desired extentthe ad ustment of said needle valve by rotary movement and for settingsaid choke at any desired extent by axial displacement, arm meanscarrying said manipulating member at its one end, means at the oppositeend of said arm means for pivotal connection With said rotatablyadjustable needle valve stem, said arm means comprising telescopicallyrelated sliding members for attainingv variable effective length of saidarm means incidentupon axial displacement of said manipulating member,

- placement rotation transmitting articulated meansfor said arm meansfor efi'ectingrotational disof said rotatably adjustable needle valvestem, a collar rotatably loosely mounted on sa'idarm, means to affordrotational movement of s'aidarm means freely of said collar, meansconnecting said collar with said choke for operating said choke uponaxial displacement of said collar in'one direction and "stop means onsaid arm means for engaging said collar when sald manipulating memberand therewith said arm means are position; of an adjusting device havinga manipulating member for regulating to any desired extent theadjustment of said needle valve by rotary movement and for setting.

said choke at any desired extent by axial displacement, arm meanscarrying said manipulating member at its one end, means at the oppositeend of said arm means for pivotal connection with said rotatablyadjustable needle valve stem,

said arm means comprising telescopically related members for attainingvariable effective length of said arm means incident upon axialdisplacement I of said manipulating member, rotation transmittingarticulated means for saidfiarm, means for efiecting rotationaldisplacement of said rotatably adjustable needle valve stem,- a collarrotatably loosely mounted on saidarm means to afford rotational movementof said arm means freely of said collar, means connecting said collarwith said choke for operating said choke upon axial displacement of saidcollar in one direction and stop means on said arm means for engagingsaid collar when said manipulating member and therewith said-arm meansare axially displaced in said one direction,.said arm; means being freeof-any stop forsaid collar in its opposite axial displacement andthereby I "operate said choke to any desiredextent independently of theextent of adjustment of 1 said needle valve stem. g-In testimon Vspecification t is 25th 'day of Apri 1924 J. RUSSELL TITMAN.

whereoflghave .si ed this i

